Device for driving optical system

Abstract

An objective lens ( 1 ) for focusing light on an optical recording medium (not shown) and irradiating the same with the focused light is held on a lens holder ( 2 ). A support member ( 10 ) is provided on a base member ( 9 ) as a foundation of a device for driving optical system. The lens holder ( 2 ) is supported on the support member ( 10 ). Six linear elastic bodies ( 7 a through 7 f ) of the same length are cylindrically shaped. The lens holder ( 2 ) is supported on the support member ( 10 ) by the linear elastic bodies ( 7 a through 7 f ). A center of a circle formed by the ends of the linear elastic bodies ( 7 a through 7 f ) is an axis of point symmetry thereof. Distances between adjacent ones of the ends of the linear elastic bodies ( 7 a through 7 f ) are all the same.

What is claimed is:  
     
       1. A device for driving optical system, comprising: 
       an optical system for focusing light on an optical recording medium and irradiating said optical recording medium with focused light;  
       a holder for holding said optical system;  
       a support member for supporting said holder;  
       a support system including at least six linear elastic bodies having the same length, said linear elastic bodies respectively having one ends fixed to said support member and arranged thereon approximately in a circle, and other ends fixed to said holder and arranged thereon approximately in a circle, to support said holder on said support member;  
       a focusing drive system for driving said holder in a direction of an optical axis of said optical system;  
       a tracking drive system for driving said holder in a radial direction of said optical recording medium; and  
       a tilting drive system for driving said holder in a direction in which rotation moment generates about an axis, said axis being perpendicular to said direction of said optical axis and to said radial direction of said optical recording medium.  
     
     
       2. The device according to  claim 1 , wherein 
       in said support system, said ends of said linear elastic bodies on said support member and said ends of said linear elastic bodies on said holder have respective axes of point symmetry.  
     
     
       3. The device according to  claim 1 , wherein 
       in said support system, distances between adjacent ones of said ends of said linear elastic bodies on said support member and distances between adjacent ones of said ends of said linear elastic bodies on said holder are all the same, respectively.  
     
     
       4. The device according to  claim 1 , wherein 
       in said support system, said circle formed by said ends of said linear elastic bodies on said support member and said circle formed by said ends of said linear elastic bodies on said holder are approximately the same in size.  
     
     
       5. The device according to  claim 1 , wherein 
       in said support system, said circle formed by said ends of said linear elastic bodies on said support member and said circle formed by said ends of said linear elastic bodies on said holder are different in size.  
     
     
       6. The device according to  claim 1 , wherein 
       in said support system, both on said support member and on said holder, distances between said ends of said linear elastic bodies adjacent to each other in said direction of said optical axis are shorter than distances between said ends of said linear elastic bodies adjacent to each other in a direction perpendicular to said direction of said optical axis.  
     
     
       7. The device according to  claim 1 , wherein 
       in said support system, said at least six linear elastic bodies include the same material.